Catalysts for polymerizing alpha-olefins and process for polymerizing alpha-olefins in contact with said catalysts
US4226741A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 17, 1978 |
| Grant date | Oct 7, 1980 |
| Priority date | — |
| Expiry date | Aug 17, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/022
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New highly active and highly stereospecific catalysts for the polymerization of alpha-olefins are disclosed, the starting components of which are PA1 (a) an organometallic-compound of Al free from halogen atoms bound directly to the Al atom; PA1 (b) an electron-donor compound (such as a Lewis base) in an amount such that 15% to 100% of the organometallic Al compound (a) is combined with the electron-donor compound; and PA1 (c) a solid component comprising, at least on the surface, the reaction product of a halogenated Mg compound with a tetravalent Ti compound and with an electron-donor compound, the molar ratio electron-donor compound/Ti being higher than 0.2, and the molar ratio halogen atoms/Ti being higher than 4. Processes for polymerizing the alpha-olefins and mixtures thereof with ethylene in contact with the new catalysts are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.